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Labs · saved on this device only

Lab Panel Interpreter

Type in a full panel and every marker is flagged against its range, with a link to its entry.

Everything you enter is saved only in this browser. Nothing is sent to a server.

Guidelines want morning draws for testosterone.

Markers (leave blank any you don't have)

264 to 916
50 to 210
10 to 57
10 to 40
41 to 50, watch above 54
13.5 to 17.5
up to 4
1.7 to 8.6
1.5 to 12.4

What Each Marker Tells You

Total testosterone
All testosterone in the blood, bound and free. The first number any diagnosis rests on, ideally drawn before 10 a.m. on two separate mornings. Harmonized range for men 19 to 39 (Travison 2017). Many labs print a wider or narrower interval.
Free testosterone
The small unbound fraction that tissues can use. Method-dependent: calculated (Vermeulen) and equilibrium dialysis values differ from direct immunoassays. Typical interval for calculated or equilibrium-dialysis free T. Direct analog immunoassays use very different numbers; use your lab's range.
SHBG
The carrier protein that binds most testosterone. High SHBG can make a normal total T behave like a low one; low SHBG does the reverse. Typical adult male interval. Rises with age and with liver or thyroid changes.
Estradiol (sensitive assay)
Testosterone converts to estradiol via aromatase. Men need some. Both very low and very high values carry symptoms. Typical interval for an LC/MS or 'sensitive' assay. Standard immunoassays are not reliable at male levels.
Hematocrit
The share of blood volume that is red cells. Testosterone raises it; it is the most common lab change that leads to a dose or frequency change. Typical adult male interval. Altitude, smoking, dehydration and sleep apnea all push it up.
Hemoglobin
Oxygen-carrying protein in red cells. Moves with hematocrit. Typical adult male interval.
PSA
Prostate-specific antigen. Checked before starting and at intervals on therapy. The trend matters as much as the number. Age-specific cut-offs exist; 4.0 ng/mL is the common general threshold (Endocrine Society 2018).
LH
The pituitary signal that tells the testes to make testosterone. Low T with high LH points to the testes; low T with low or normal LH points to the pituitary or hypothalamus. Suppressed on TRT. Typical adult male interval for men not on testosterone. Expected to be near zero on therapy.
FSH
The pituitary signal for sperm production. Also suppressed on TRT, which is why fertility drops. Typical adult male interval for men not on testosterone.

Frequently Asked Questions

Which reference ranges does this tool use?
Typical adult male intervals, listed under each marker with a note on where they come from. Total testosterone uses the harmonized Travison 2017 range. Hematocrit and PSA monitoring thresholds follow the 2018 Endocrine Society guideline. Every lab prints its own interval and that one takes precedence over anything here.
Why is my free testosterone flagged when my lab says it's normal?
Free testosterone is method-dependent. Calculated and equilibrium-dialysis values sit in a very different numeric range from direct analog immunoassays. If your report used a direct assay, ignore the flag here and use your lab's range.
What does 'watch' mean on hematocrit or PSA?
It marks a guideline monitoring threshold, not an emergency. The Endocrine Society guideline treats hematocrit above 54 percent, PSA above 4.0 ng/mL, or a PSA rise of more than 1.4 ng/mL within a year of starting therapy, as reasons to review with the prescribing clinician.
Where is my data stored?
Only in this browser's local storage, on this device. Nothing is sent to TRT Foundation or anyone else. Clearing site data removes saved panels. Use the export button to keep a copy.
Can I bring this to my doctor?
Yes, that is what it is for. The saved history shows how each marker moved between draws, which is often more useful to a clinician than any single value.

Sources

  1. Travison TG et al. Harmonized Reference Ranges for Circulating Testosterone Levels in Men. J Clin Endocrinol Metab. 2017;102(4):1161-1173
  2. Bhasin S et al. Testosterone Therapy in Men With Hypogonadism: An Endocrine Society Clinical Practice Guideline. J Clin Endocrinol Metab. 2018;103(5):1715-1744
  3. Mulhall JP et al. Evaluation and Management of Testosterone Deficiency: AUA Guideline. J Urol. 2018;200(2):423-432

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This tool is educational and does not diagnose, treat or recommend any dose. Results depend on the numbers and assumptions you enter. Talk to a licensed clinician about your own results. See the medical disclaimer and terms of use.